A novel method for aqueous synthesis of CdTe duantum dots
| Autor: | Shoujun Yi, Deng Keqin, Haowen Huang, Feng Lei, Yuan Xiaoyun, Kuang Huiyan, Wang Tianlun, Yunlong Zeng, Chunran Tang |
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| Rok vydání: | 2014 |
| Předmět: |
Luminescence
Photoluminescence Aqueous solution Passivation Chemistry Analytical chemistry Hydroxylamine Atomic and Molecular Physics and Optics Cadmium telluride photovoltaics Analytical Chemistry X-Ray Diffraction Quantum dot Quantum Dots Cadmium Compounds Cysteine Tellurium Fourier transform infrared spectroscopy Absorption (chemistry) Oxidation-Reduction Instrumentation Spectroscopy Powder diffraction Nuclear chemistry |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 123:298-302 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2013.12.085 |
| Popis: | We have developed a simple and an economical one-pot method to synthesize water-soluble CdTe quantum dots (QDs) using hydroxylamine hydrochloride (HAH) as reduction and l -cysteine (CYS) as the ligand. The size of the CdTe QDs could easily be controlled by the duration of reflux and monitored by absorption and photoluminescence spectra. The factors influencing the photoluminescence quantum yields (PL QYs) on the QYs of CdTe NCs were investigated and the optimum conditions were determined. Under the optimum conditions (pH = 11.0, the concentration of Cd2+ was 1.0 mmol L−1 and the molar ratio of Cd2+:Te2−:CYS:HAH was 1:0.05:2.4:5), photoluminescence quantum yields of the CdTe QDs have been improved significantly and the maximum QYs of the QDs can achieve to 47%. The QDs were characterized by Fourier transform infrared spectrometry (FTIR), transmission-electron microscopy (TEM) and X-ray powder diffraction (XRD). The XRD patterns indicated that CdS was formed in the preparation process of CdTe QDs. This CdS shell could effectively passivate the surface trap states, and enhance the PL QY and stability of the CdTe QDs. |
| Databáze: | OpenAIRE |
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